13  * Device driver for TCG/TCPA TPM (trusted platform module).
21  * Note, the TPM chip is not interrupt driven (only polling)
34 #include "tpm.h"
42  * Bug workaround - some TPM's don't flush the most
55  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
445 	 * If the command is not implemented by the TPM, synthesize a  in tpm_try_transmit()
577  * tpm_transmit - Internal kernel interface to transmit TPM commands.
579  * @chip: TPM chip to use
580  * @space: tpm space
581  * @buf: TPM command buffer
582  * @bufsiz: length of the TPM command buffer
583  * @flags: tpm transmit flags - bitmap
586  * returns from the TPM and retransmits the command after a delay up
646  * tpm_transmit_cmd - send a tpm command to the device
647  *    The function extracts tpm out header return code
649  * @chip: TPM chip to use
650  * @space: tpm space
651  * @buf: TPM command buffer
654  * @flags: tpm transmit flags - bitmap
660  *     A positive number for a TPM error.
678 		dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,  in tpm_transmit_cmd()
694  * tpm_startup - turn on the TPM
695  * @chip: TPM chip to use
697  * Normally the firmware should start the TPM. This function is provided as a
699  * example when a TPM emulator is used.
708 	dev_info(&chip->dev, "starting up the TPM manually\n");  in tpm_startup()
725 			      "attempting to start the TPM");  in tpm_startup()
818 			"A TPM error (%zd) occurred attempting to determine the timeouts\n",  in tpm_get_timeouts()
900 		dev_info(&chip->dev, "Adjusting TPM timeout parameters.");  in tpm_get_timeouts()
918  * tpm_continue_selftest -- run TPM's selftest
919  * @chip: TPM chip to use
922  * a TPM error code.
1044  * Note: with TPM 2.0 extends also those banks with a known digest size to the
1084  * tpm_do_selftest - have the TPM continue its selftest and wait until it
1086  * @chip: TPM chip to use
1089  * a TPM error code.
1106 		dev_info(&chip->dev, "TPM not ready (%d)\n", rc);  in tpm_do_selftest()
1108 	/* This may fail if there was no TPM driver during a suspend/resume  in tpm_do_selftest()
1124 			    "TPM command timed out during continue self test");  in tpm_do_selftest()
1131 				 "TPM is disabled/deactivated (0x%X)\n", rc);  in tpm_do_selftest()
1132 			/* TPM is disabled and/or deactivated; driver can  in tpm_do_selftest()
1133 			 * proceed and TPM does handle commands for  in tpm_do_selftest()
1148  * tpm1_auto_startup - Perform the standard automatic TPM initialization
1150  * @chip: TPM chip to use
1163 		dev_err(&chip->dev, "TPM self test failed\n");  in tpm1_auto_startup()
1175  * tpm_send - send a TPM command
1177  * @cmd:	a TPM command buffer
1178  * @buflen:	the length of the TPM command buffer
1207  * We are about to suspend. Save the TPM state
1229 	/* for buggy tpm, flush pcrs with extend to selected dummy */  in tpm_pm_suspend()
1241 		 * If the TPM indicates that it is too busy to respond to  in tpm_pm_suspend()
1243 		 * several seconds for this TPM to be ready.  in tpm_pm_suspend()
1245 		 * This can happen if the TPM has already been sent the  in tpm_pm_suspend()
1248 		 * may cause the TPM to invalidate previously saved state.  in tpm_pm_suspend()
1259 		dev_warn(&chip->dev, "TPM savestate took %dms\n",  in tpm_pm_suspend()
1268  * the TPM state.
1289  * tpm_get_random() - get random bytes from the TPM's RNG
1359  * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
1386  * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
1413 	tpm_class = class_create(THIS_MODULE, "tpm");  in tpm_init()
1415 		pr_err("couldn't create tpm class\n");  in tpm_init()
1426 	rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm");  in tpm_init()
1428 		pr_err("tpm: failed to allocate char dev region\n");  in tpm_init()
1449 MODULE_DESCRIPTION("TPM Driver");